Question

我有一个示例代码，如下所示，套接字绑定到IP 10.10.88.11和端口9876.我使用wireshark测试了2个条件，如下所示。两台PC都在同一个子网中。

从同一台PC（10.10.88.11）发送UDP数据包 - 能够接收的UDP服务器
从另一台电脑发送UDP数据包（10.10.88.10） - UDP服务器无法接收，但Wireshark（10.10.88.11）能够捕获数据包

我搜索了互联网，但无法找到解决方案。我在创建InetScoketAddress时有什么问题吗？

import java.io.*;
import java.net.*;

public class UDPServer {
    public static void main(String args[]) throws Exception {        

     InetSocketAddress address = new InetSocketAddress("10.10.88.11", 9876);

     DatagramSocket serverSocket = new DatagramSocket(address);
        byte[] receiveData = new byte[1024];
        byte[] sendData = new byte[1024];
        while(true)
           {
              DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
              System.out.println("Waiting to receive");
              serverSocket.receive(receivePacket);
              String sentence = new String( receivePacket.getData());
              System.out.println("RECEIVED: " + sentence);
              InetAddress IPAddress = receivePacket.getAddress();
              int port = receivePacket.getPort();
              String capitalizedSentence = sentence.toUpperCase();
              sendData = capitalizedSentence.getBytes();
              DatagramPacket sendPacket =
              new DatagramPacket(sendData, sendData.length, IPAddress, port);
              serverSocket.send(sendPacket);
           }

  }
}

Answer 1

我相信Wireshark能够在防火墙评估之前抓取数据包，这意味着您将检测到它们但它们永远不会到达Java应用程序。您是否尝试停用防火墙？

JAVA UDP服务器无法接收数据包

1 个答案: